EP0676635B1 - Inspection de récipients transparents - Google Patents

Inspection de récipients transparents Download PDF

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Publication number
EP0676635B1
EP0676635B1 EP95105059A EP95105059A EP0676635B1 EP 0676635 B1 EP0676635 B1 EP 0676635B1 EP 95105059 A EP95105059 A EP 95105059A EP 95105059 A EP95105059 A EP 95105059A EP 0676635 B1 EP0676635 B1 EP 0676635B1
Authority
EP
European Patent Office
Prior art keywords
container
light
container bottom
sensor
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95105059A
Other languages
German (de)
English (en)
Other versions
EP0676635A1 (fr
Inventor
Timothy A. Kohler
James A. Ringlien
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Owens Brockway Glass Container Inc
Original Assignee
Owens Brockway Glass Container Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Owens Brockway Glass Container Inc filed Critical Owens Brockway Glass Container Inc
Publication of EP0676635A1 publication Critical patent/EP0676635A1/fr
Application granted granted Critical
Publication of EP0676635B1 publication Critical patent/EP0676635B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G01N21/9045—Inspection of ornamented or stippled container walls
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
    • G01N21/9009—Non-optical constructional details affecting optical inspection, e.g. cleaning mechanisms for optical parts, vibration reduction

Definitions

  • the invention relates to an apparatus and a method for inspecting the bottom of a container according to the preamble of claims 1 and 5, respectively.
  • a viewing camera has a limited, stripe-like field of vision.
  • a U-shaped lamp illuminates the container bottom from beneath as it is rotated, and a grate-like light-blocking plate is used to illuminate only lateral regions of the container bottom, i.e. an area on and adjacent to the field of vision and an area that extends perpendicular on both sides from positions of the baffle mark are not directly illuminated.
  • Light travelling in the container bottom from the lateral illuminated regions hits on defects which can be detected when passing through the field of vision.
  • the hope is that the baffle mark, seam lines and ribbings do not scatter the light in direction of the camera when passing through the field of vision. In any case, if these variations from the flat surface are dirty, they cannot be detected as defects.
  • Light rays normally travel from the source straight through the container wall and are then focused onto the camera, and are viewed by the camera at a given intensity.
  • a refractive commercial variation bends the light ray as it travels through the container wall, so that the image projected onto the camera is of a different area of the light source. If such different area has a different intensity than the area normally imaged onto the camera, the camera can detect the refractive site.
  • An opaque site such as a stone blocks transmission of light through the container wall, and can therefore be detected as a dark spot against a light background.
  • US-A-5,243,400 discloses a technique for varying the effective intensity of the light source across the light source.
  • a light control film is positioned adjacent to the light source between the light source and the container, and comprises a plurality of parallel slats spaced from each other so as to limit the angle from which the image of the light source can be viewed by the camera.
  • Commercial variations are detected as a function of variations in light intensity received at the camera. Any refractive variation in the container wall refracts or bends the line of sight of the camera at an angle to the camera axis. As this angle increases, the slats progressively obstruct the light source, until the camera can no longer see the light source at the critical viewing angle of the slats.
  • Apparatus for inspecting the bottom of a container in in accordance with the presently preferred embodiments of the invention includes a light sensor positioned to view the container bottom through the open container mouth, a light source positioned externally of the container on the opposite side of the container bottom, and electronics for detecting commercial variations in the container bottom as a function of light energy incident on the sensor.
  • the light source as viewed by the sensor through the container bottom, is characterized by being elongated in one direction relative to the container bottom - i.e., in the radial direction - and narrow in the transverse direction.
  • any variations in the container bottom that refract the line of sight of the sensor in the radial direction are essentially transparent as viewed by the sensor.
  • variations that refract the sensor line of sight laterally of the container bottom, such as glass particles, knots and lumps produce a dark image at the sensor since the sensor cannot see the light source through the variation.
  • the light source in the preferred embodiments is constructed to be characterized by an elongate radial dimension and narrow lateral dimension by either constructing the light source to be physically long and narrow, or by employing a light control film as in the above-noted U.S. Patent with parallel slats extending radially of the container bottom.
  • the light source is characterized by a wide illumination angle radially of the container bottom and a narrow illumination angle transversely of the container bottom.
  • the light source extends across the entire diameter of the container bottom
  • the light sensor comprises a line scan camera having an array of light sensitive elements that receive an image of the container bottom as illuminated by the light source across the entire diameter of the container bottom (i.e., including the base and heel).
  • the container is rotated during inspection about its central axis, and the sensor array is scanned at increments of container rotation to develop a two-dimensional image of the container bottom. This image may be analyzed for refractive and opaque commercial variations employing otherwise conventional techniques.
  • FIGS. 1 and 2 illustrate inspection station apparatus 10 for inspecting the bottoms 12 of a translucent containers 14 - i.e., the base 16 and heel 18 of containers 14.
  • Sequential containers 14 are brought to the inspection station of apparatus 10 by a starwheel conveyor or the like that moves the container along a slide plate 20 into registry with a slot 22.
  • a light source 24 is positioned beneath slide plate 20 to illuminate container bottom 12 through slot 22.
  • a line scan camera 26 is positioned above container 14 in apparatus 10 to view bottom 12 of container 14 through the open container mouth 28, and thus to view the image of light source 24 through the container bottom and slide plate slot 22.
  • Light source 24 is long and thin, as best seen by comparing FIGS. 1 and 2, with the elongated dimension of light source 24 extending diametrically across the container bottom intersecting the container axis 25 (FIG. 3).
  • Light source 24 may comprise an elongated incandescent lamp or a series of individual lamps that illuminate the bottom of container 14 through a diffuser.
  • Line scan camera 26 includes a linear array sensor 30 having a plurality of light sensing elements disposed along a line parallel to the elongated dimension of light source 24 and intersecting the container axis.
  • a lens 32 focuses the image of container bottom 12, as illuminated by light source 24, onto linear array sensor 30, viewed through open mouth 28 of container 14.
  • Container 14 in apparatus 10 is engaged by a suitable mechanism 36 for rotating the container about its central axis 25.
  • Camera 26 is coupled to an information processor 34 for scanning sensor 30 at increments of container rotation.
  • FIG. 3 illustrates the geometry of light source 24 relative to container bottom 12, being elongated diametrically of the container and narrow laterally of the container as noted above.
  • a refractive variation 38 (FIG. 5) that refracts the camera line of sight essentially in a radial direction, such as a baffle scar or mold code ring, enters the camera field of view, the refractive variation does not affect intensity of light incident on the sensor because the sensor will still see the light source because of its elongated dimension in the radial direction.
  • a refractive variation 40 FIG.
  • FIG. 6 illustrates a modified apparatus 42 in accordance with the present invention, in which the light source 44 is made narrow in the lateral direction by means of a light control film 46 having a plurality of spaced parallel slats 48 extending diametrically across the bottom 12 of container 14.
  • Any variations 38 (FIG. 5) that refract the camera line of sight in the radial direction will not affect the camera image of the container bottom because the refraction is in a direction parallel to slats 48.
  • any variation 40 (FIG. 4) that refracts the camera line of sight laterally of the light source will cause progressive obstruction of the light source as seen by the camera, until the camera can no longer see the light source through the container bottom at the critical viewing angle of the slats.
  • FIGS. 1-5 cause the image to be either bright or dark when the camera line of sight is refracted off of the light source
  • the embodiment of FIG. 6 provides levels of gray between an unobstructed view of the light source and a completely obstructed view of the light source at the critical viewing angle of the light control film slats.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Eye Examination Apparatus (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Laminated Bodies (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Measuring Cells (AREA)

Claims (6)

  1. Dispositif pour inspecter le fond (12) d'un récipient (14) comportant une embouchure ouverte (28) et un axe central (25), ledit dispositif comprenant :
    des moyens de détection de la lumière (26) avec une lentille (32) positionnée pour obtenir, à travers l'embouchure du récipient (28), l'image d'une zone en bande (22) sur le fond du récipient (12),
    une source de lumière (24 ; 44) positionnée à l'extérieur du récipient sur un côté du fond du récipient (12) opposé à l'embouchure du récipient (28),
    des moyens (34) pour détecter des variations commerciales dans le fond du récipient (12) en fonction de l'énergie lumineuse incidente sur lesdits moyens de détection (26), et
    des moyens (36) pour faire tourner le récipient (14) autour de son axe central (25),
       caractérisé en ce que :
       ladite source de lumière (24 ; 44) est allongée dans la direction de la zone en bande (22) et étroite dans la direction transversale, de telle sorte que ladite zone en bande (22) sur le fond du récipient (12) éclaire de telle sorte que des particules opaques et des points de réfraction (40) qui réfractent la lumière dans une direction latérale, vue depuis la zone en bande éclairée (22), apparaissent sous la forme de points sombres sur les moyens de détection de la lumière (26), tandis que les variations de réfraction (38) qui réfractent la lumière dans la direction de la zone en bande ne seront pas enregistrées dans la zone en bande éclairée.
  2. Dispositif selon la revendication 1, dans lequel ladite zone en bande éclairée (22) sur le fond du récipient (12) s'étend diamétralement à travers le fond du récipient.
  3. Dispositif selon la revendication 1 ou 2, dans lequel des moyens de direction de la lumière (46) comprennent une pluralité de lames parallèles (48) s'étendant radialement par rapport au fond du récipient (12), espacées les unes des autres de façon à limiter l'angle latéral à partir duquel l'image de ladite source de lumière (44) peut être vue au niveau desdits moyens de détection (26).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, dans lequel lesdits moyens de détection de la lumière (26) comprennent un détecteur à groupement (30) comportant une pluralité d'éléments de détection disposés en un groupement qui s'étend radialement par rapport au récipient, et dans lequel lesdits moyens de détection de variations (34) comprennent des moyens pour balayer ledit groupement par incréments de rotation du récipient de façon à développer une image en deux dimensions du fond du récipient.
  5. Procédé d'inspection du fond (12) d'un récipient (14) comportant une embouchure ouverte (28) et un axe central (25), ledit procédé comprenant les étapes suivantes :
    (a) le positionnement d'un détecteur de lumière (26) avec une lentille (32) de façon à obtenir, à travers l'embouchure du récipient (28), l'image d'une zone en bande (22) sur le fond du récipient (12), et
    (b) la rotation du récipient (14) autour de son axe (25),
       caractérisé par :
    (c) l'éclairage de ladite zone en bande (22) sur le fond du récipient (12) par une source de lumière allongée étroite (24 ; 44) depuis l'extérieur du récipient en alignement axial avec ledit détecteur (26) de telle sorte que des variations commerciales telles que des particules opaques et des points de réfraction (40) qui réfractent la lumière dans une direction latérale vue depuis la zone en bande éclairée (22) apparaissent sous la forme de points sombres au niveau des moyens de détection de la lumière (26), tandis que les variations de réfraction (38) qui réfractent la lumière dans la direction de la zone en bande ne seront pas enregistrées dans la zone en bande éclairée, et
    (d) la détection des variations commerciales dans le fond (12) du récipient en fonction de l'intensité d'énergie lumineuse incidente sur ledit détecteur (26) à partir de ladite zone en bande éclairée (22).
  6. Procédé selon la revendication 6, comprenant l'étape additionnelle suivante : (d) la rotation du récipient (14) autour de son axe (25) lors de la réalisation desdites étapes (b) et (c).
EP95105059A 1994-04-08 1995-04-05 Inspection de récipients transparents Expired - Lifetime EP0676635B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US224208 1994-04-08
US08/224,208 US5466927A (en) 1994-04-08 1994-04-08 Inspection of translucent containers

Publications (2)

Publication Number Publication Date
EP0676635A1 EP0676635A1 (fr) 1995-10-11
EP0676635B1 true EP0676635B1 (fr) 2001-08-08

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ID=22839704

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95105059A Expired - Lifetime EP0676635B1 (fr) 1994-04-08 1995-04-05 Inspection de récipients transparents

Country Status (17)

Country Link
US (1) US5466927A (fr)
EP (1) EP0676635B1 (fr)
JP (1) JP3607744B2 (fr)
KR (1) KR100363149B1 (fr)
CN (1) CN1104644C (fr)
AT (1) ATE204080T1 (fr)
AU (1) AU681939B2 (fr)
BR (1) BR9501507A (fr)
CA (1) CA2146094C (fr)
CO (1) CO4600713A1 (fr)
DE (1) DE69522028T2 (fr)
DK (1) DK0676635T3 (fr)
ES (1) ES2161249T3 (fr)
PE (1) PE5696A1 (fr)
PL (1) PL176293B1 (fr)
PT (1) PT676635E (fr)
ZA (1) ZA952851B (fr)

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RU2635845C2 (ru) * 2012-07-23 2017-11-16 Эм Эс Си Энд Эс Джи Си Си Способ и установка для обнаружения, в частности, преломляющих дефектов

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US9677988B1 (en) 2015-07-10 2017-06-13 David E. Doggett Integrating radiation collection and detection apparatus
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FR3056297B1 (fr) * 2016-09-19 2018-10-05 Tiama Dispositif pour l'inspection optique de recipients en verre en sortie de machine de formage
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Also Published As

Publication number Publication date
BR9501507A (pt) 1995-11-07
DE69522028T2 (de) 2001-11-15
ZA952851B (en) 1995-12-21
ES2161249T3 (es) 2001-12-01
DK0676635T3 (da) 2001-12-03
JPH0854354A (ja) 1996-02-27
PL176293B1 (pl) 1999-05-31
PT676635E (pt) 2001-12-28
AU681939B2 (en) 1997-09-11
CA2146094A1 (fr) 1995-10-09
KR950033420A (ko) 1995-12-26
CO4600713A1 (es) 1998-05-08
CN1119738A (zh) 1996-04-03
EP0676635A1 (fr) 1995-10-11
US5466927A (en) 1995-11-14
JP3607744B2 (ja) 2005-01-05
PL308043A1 (en) 1995-10-16
DE69522028D1 (de) 2001-09-13
CN1104644C (zh) 2003-04-02
KR100363149B1 (ko) 2003-03-19
PE5696A1 (es) 1996-03-09
AU1632195A (en) 1995-10-19
ATE204080T1 (de) 2001-08-15
CA2146094C (fr) 2006-05-30

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